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Class X : Chemistry
Chapter: Chemical Reactions and Equations
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Practice Exercises ( Advanced )

 

Q1. Identify the substances oxidized and the substances reduced in the following reactions: 

(j) 4 Na(s) + O2(g)  2 Na2O (s)
(ii) CuO(s) + H2(g)  Cu(s) + H2O(I) 
Solution a

(Marks 2)
Q2. Give one example of
(i) a reaction which is double displacement reaction and also a precipitation reaction
(ii) a double displacement reaction accompanied by evolution of a gas. 
Solution a
(Marks 2)
Q3. (a)What do you mean by 'rancidity'? 
(b)Suggest one method to prevent rusting. 
Solution a
(Marks 2)
Q4. When iron rod is kept dipped in copper sulphate solution for some time, a brown coating is formed on the iron rod. Which is more reactive : iron or copper? Explain why. What change will you observe in the colour of the solution? 
Solution a
(Marks 3)
Q5. (a) What is a balanced chemical equation?
(b)Translate the following reaction into the language of chemistry and then balance it. When ferric oxide is heated with aluminium, it gives aluminium oxide and iron. What type of reaction is this? 
Solution a
(Marks 3)
Q6. What are decomposition reactions? Give one example each of
(a) thermal decomposition reaction
(b) electrolytic decomposition reaction  
Solution a
(Marks 3)
 
 
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